Tom, Congratulations!
And whilst I am sure it is in your best interests to be diplomatic with regards to the architect that you are replacing, GCA is a place for frank and honest discussion and there should be no problems with describing honestly that you have replaced Hawtree.
(If a few more people were honest about his work, he may not have made it to Australia where his work is best described as ranging from average to very poor. No other architect gets such a free ride IMO, but that is for another thread).